I am engineering a low-cost attraction and hope to use Bluetooth device identification for proximity detection -- i.e. is guest A within range of static location X. Each guest will be given a customized mobile device (either iPod or Android based).
What is a realistic upper bound on Bluetooth device "density" before enumeration of all nearby devices becomes unreliable? For instance is having 25 active devices in a vicinity of a stationary Bluetooth-enabled PC too many in one place to detect reliably and entirely (all devices)? Is this too much congestion?
(To be clear: I do not need to establish connections. I only need to reliably detect the presence or absence of devices by name.)